Ground Connection Electrode Prevents Arcing in Display Substrate
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Solution Overview
Problem
The manufacturing of display devices often faces issues with arcing during the dry etching process, which can degrade image quality due to electrical connections between ground lines and pads, leading to thermal electron flow and potential damage to the display device.
Innovation Solution
A mother substrate design with strategically placed ground lines, pads, and connection electrodes, where the ground lines and pads are electrically insulated and connected through a ground connection electrode, preventing arcing by ensuring a discharge path for static electricity during the deposition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground lines and ground pads are directly connected during dry etching, then electrical connectivity is achieved, but arcing occurs causing thermal electron flow and image quality degradation
Solution Approach 1:
The patent introduces a ground connection electrode as an intermediary component between the ground line and ground pad. This mediator allows electrical connection to be established through a controlled deposition process rather than direct contact during etching, preventing arcing while achieving the desired electrical connectivity. The ground connection electrode serves as a buffer that eliminates the harmful direct interaction between ground line and pad during the etching process.
2Object-affected harmful factors
If ground lines and ground pads are spaced apart to prevent arcing, then image quality is maintained, but electrical connectivity is lost
Solution Approach 1:
The ground connection electrode acts as a mediator that bridges the spaced-apart ground line and ground pad. By maintaining physical separation during etching (preventing arcing) while introducing this intermediate conductive element, the patent achieves both arcing prevention and electrical connectivity. The mediator enables the system to benefit from both spacing (harm reduction) and connection (functionality).
Solution Approach 2:
The ground connection electrode is formed in advance through deposition before the etching process occurs. This preliminary action prepares the electrical connection pathway beforehand, so that when etching takes place, the ground line and pad can be safely spaced apart without losing connectivity. The connection is established prior to the harmful etching event, preventing arcing while ensuring subsequent electrical functionality.
Data Source
AI summary
A mother substrate for producing cell areas for a plurality of display device is disclosed that includes a base substrate and a ground area. The base substrate includes a plurality of cell areas and a ground area surrounding each cell area of the plurality of cell areas. A ground line is disposed to surround an edge of each cell area of the plurality of cell areas. A ground pad is disposed to be spaced apart from the ground line on the ground area. A ground connection electrode disposed on a surface of the ground line and a surface of the ground pad electrically connects the ground line with the ground pad. Each cell area of the plurality of cell areas includes a light emitting element and a thin film transistor disposed on the light emitting element.